TRW´s Ada Process Model for incremental development of large software systems

TRW´s Ada Process Model has proved to be the key to the Command Center Processing and Display System-Replacement (CCPDS-R) project´s success in developing over 300000 lines of Ada source code executing in a distributed VAX VMS environment. The Ada Process Model is a uniform application of incremental development coupled with a demonstration-based approach to design review for continuous and insightful thread testing and risk management. The use of Ada as the life-cycle language for design evolution provides the vehicle for uniformity and a basis for consistent software progress metrics. The author provides an overview of the techniques and benefits of the Ada Process Model and describes some of the experience and lessons learned